Long-chain branched propylene polymer composition

Abstract

The present invention relates to a propylene polymer composition comprising a long chain branched propylene polymer, wherein said propylene polymer composition has a) a melt flow rate MFR2 (230° C., 2.16 kg) of 0.8 to 6.0 g/10 min b) a xylene hot insolubles (XHU) fraction in an amount of not more than 0.80 wt %, based on the total weight amount of the propylene polymer composition, c) a melting temperature Tm of at least 160.0° C., d) a F30 melt strength of from 5.0 to less than 30.0 cN, and e) a heat distortion temperature (HDT) of at least 108° C., a process for producing said propylene polymer composition by reactive modification of a propylene polymer in the presence of a peroxide, an article comprising said propylene polymer composition and the use of said propylene polymer composition for producing an article.

The invention claimed is: 
     
       1. A propylene polymer composition comprising a long chain branched propylene polymer, wherein said propylene polymer composition has
 a) a melt flow rate MFR 2  (230° C., 2.16 kg) of 0.8 to 6.0 g/10 min, 
 b) a xylene hot insolubles (XHU) fraction in an amount of not more than 0.80 wt %, based on the total weight amount of the propylene polymer composition, 
 c) a melting temperature Tm of at least 160.0° C., 
 d) a F30 melt strength of from 5.0 to less than 30.0 cN, and 
 e) a heat distortion temperature (HDT) of at least 108° C. 
 
     
     
       2. The propylene polymer composition according to  claim 1  having a crystallization temperature Tc of more than 120.0° C. 
     
     
       3. The propylene polymer composition according to  claim 1  having a V30 melting extensibility of at least 190 mm/s. 
     
     
       4. The propylene polymer composition according to  claim 1  having a flexural modulus of more than 1900 MPa. 
     
     
       5. An article comprising the propylene polymer composition according to  claim 1 .